Anders Langlands: Even though you’ve only got an RGB renderer I believe but cannot prove that using the camera native RGB as your rendering space will actually improve the accuracy of your renders, but that’s something that needs further investigation.
Setting aside the catastrophic impact increment to decrement mismatches have on picture making for a moment…
If folks realize that luminance invariance by way of 3x3 colourimetry transforms leads to overall energy mishaps, then Mr. Langlands is plausibly correct in his estimation; the computations by way of the basic operators of multiplication and addition will deviate quite significantly from the relative wattages present in front of the camera. Daniel Brylka tried to point this out a few times in this forum regarding the problematic definition of albedos relative to a colourimetric space, but it sadly fell upon deaf ears.
I am cautiously confident a clever mind can showcase a clear demonstration of how the relative wattages go sideways under orthodox 3x3 colourimetric matrices.
Assuming a quantal catch is unmodified (shame on the vendors that take their camera quantal catches to a colourimetrically defined “space”) the energy increment to decrement relationships will remain intact in the rendering model.